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<head>
  <meta charset="utf-8">
	<title>Events</title>

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<body>
	<tone-example label="Events">
		<div slot="explanation">
			Tone's Event classes (<a href="https://tonejs.github.io/docs/ToneEvent">Tone.ToneEvent</a>,
				<a href="https://tonejs.github.io/docs/Loop">Tone.Loop</a>,
				<a href="https://tonejs.github.io/docs/Part">Tone.Part</a> and
				<a href="https://tonejs.github.io/docs/Sequence">Tone.Sequence</a>)
			simplify scheduling events along the Transport. Each class abstracts away calls to
				<a href="https://tonejs.github.io/docs/Transport.schedule">Transport.schedule</a> or
				<a href="https://tonejs.github.io/docs/Transport.scheduleRepeat">scheduleRepeat</a>
			and lets you create precise, rhythmic events which are startable, stoppable and loopable.
			(note that ToneEvent was called <a href="https://tonejs.github.io/docs/Event">Event</a> before Tone.js 14.x)
		</div>

		<div id="content">
			<tone-play-toggle></tone-play-toggle>
		</div>
	</tone-example>

	<script type="text/javascript">
		/**
		 * KICK
		 */
		const kick = new Tone.MembraneSynth({
			envelope: {
				sustain: 0,
				attack: 0.02,
				decay: 0.8
			},
			octaves: 10,
			pitchDecay: 0.01,
		}).toDestination();

		const kickPart = new Tone.Loop(((time) => {
			kick.triggerAttackRelease("C2", "8n", time);
		}), "2n").start(0);
				
		/**
		 * SNARE
		 */
		const snare = new Tone.NoiseSynth({
			volume: -10,
			envelope: {
				attack: 0.001,
				decay: 0.2,
				sustain: 0
			}
		}).toDestination();

		const snarePart = new Tone.Loop(((time) => {
			snare.triggerAttack(time);
		}), "2n").start("4n");

		/**
		 * PIANO
		 */
		const keys = new Tone.PolySynth(Tone.Synth, {
			volume: -8,
			oscillator: {
				partials: [1, 2, 1],
			},
		}).toDestination();

		const cChord = ["C4", "E4", "G4", "B4"];
		const dChord = ["D4", "F4", "A4", "C5"];
		const gChord = ["B3", "D4", "E4", "A4"];

		const pianoPart = new Tone.Part(((time, chord) => {
			keys.triggerAttackRelease(chord, "8n", time);
		}), [["0:0:2", cChord], ["0:1", cChord], ["0:1:3", dChord], ["0:2:2", cChord], ["0:3", cChord], ["0:3:2", gChord]]).start("2m");

		pianoPart.loop = true;
		pianoPart.loopEnd = "1m";
		pianoPart.humanize = true;

		/**
		 * BASS
		 */
		const bass = new Tone.MonoSynth({
			volume: -10,
			envelope: {
				attack: 0.1,
				decay: 0.3,
				release: 2,
			},
			filterEnvelope: {
				attack: 0.001,
				decay: 0.01,
				sustain: 0.5,
				baseFrequency: 200,
				octaves: 2.6
			}
		}).toDestination();

		const bassPart = new Tone.Sequence(((time, note) => {
			bass.triggerAttackRelease(note, "16n", time);
		}), ["C2", ["C3", ["C3", "D2"]], "E2", ["D2", "A1"]], "4n").start(0);

		bassPart.probability = 0.9;

		// set the transport 
		Tone.Transport.bpm.value = 90;

		drawer().add({
			name: "Kick",
			tone: kick,
			open: false,
		}).add({
			name: "Snare",
			tone: snare,
			open: false,
		}).add({
			name: "Bass",
			tone: bass,
			open: false,
		}).add({
			name: "Keys",
			tone: keys,
			open: false,
		});

		// bind the interface
		document.querySelector("tone-play-toggle").addEventListener("start", e => Tone.Transport.start());
		document.querySelector("tone-play-toggle").addEventListener("stop", e => Tone.Transport.stop());
				
	</script>
</body>
</html>
